參數(shù)資料
型號: MC68HC05J3CDW
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封裝: PLASTIC, SOIC-20
文件頁數(shù): 36/92頁
文件大?。?/td> 912K
代理商: MC68HC05J3CDW
MC68HC05J3
MOTOROLA
6-1
16-BIT PROGRAMMABLE TIMER
6
16-BIT PROGRAMMABLE TIMER
The programmable timer on the MC68HC05J3 consists of a 16-bit read-only free-running counter,
with a xed divide-by-four prescaler, plus the input capture/output compare circuitry. Selected
input edges cause the current counter value to be latched into a 16-bit input capture register so
that software can later read this value to determine when the edge occurred. When the free
running counter value matches the value in the output compare registers, the programmed pin
action takes place. Refer to Figure 6-1 for a block diagram of the timer. The input capture and
output compare functions can only be enabled by setting bit 4 and bit 5 of the port B conguration
register as described in Section 4.4.3.
The timer has a 16-bit architecture, hence each specic functional segment is represented by two
8-bit registers. These registers contain the high and low byte of that functional segment. Accessing
the low byte of a specic timer function allows full control of that function; however, an access of
the high byte inhibits that specic timer function until the low byte is also accessed.
Note:
The I-bit in the CCR should be set while manipulating both the high and low byte register
of a specic timer function to ensure that an interrupt does not occur.
TPG
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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